The Japanese government proposed a target to rebuild between two and five nuclear reactors by the 2040s [1].

This move marks the first time the state has set a numeric goal for nuclear replacement since the Fukushima Daiichi accident occurred 15 years ago [1]. By establishing these targets, the Ministry of Economy, Trade and Industry (METI) intends to provide a long-term investment signal to the energy sector while securing a stable power supply.

The proposal, presented at a METI council meeting, includes a secondary target to rebuild between 11 and 14 reactors by the 2050s [1, 2]. The plan arrives as Japan faces the challenge of an aging nuclear fleet that requires modernization to remain operational and safe.

While the government's proposed range for the 2040s is two to five reactors [1], some industry data suggests a more specific need. The Federation of Electric Power Companies of Japan (電事連) said five reactors would need replacement by that time [2].

The cabinet and METI said the initiative is necessary to address the degradation of existing plants. The strategy aims to balance the need for carbon-neutral energy with the practical reality of infrastructure decay, a critical issue for the nation's grid reliability.

This shift in policy represents a departure from the cautious approach adopted in the immediate aftermath of the 2011 disaster. The government is now prioritizing the long-term viability of nuclear energy as a pillar of its energy security strategy.

“Japan proposed a target to rebuild between two and five nuclear reactors by the 2040s.”

This policy shift indicates that Japan is moving beyond the reactive phase of the post-Fukushima era and is now treating nuclear power as a permanent, long-term component of its energy mix. By providing specific numbers for the 2040s and 2050s, the government is attempting to reduce investor uncertainty and create a predictable roadmap for the energy industry to manage the decommissioning of old plants and the construction of new ones.